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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable securities | $ 102,972 | $ 90,298
Corporate Bonds [Member] |  |
Available-for-sale - matures within one year, Amortized cost | 8,756 | 11,937
Available-for-sale - matures within one year, Gross unrealized gains | 2 | 39
Available-for-sale - matures within one year, Gross unrealized losses | (23) | (7)
Available-for-sale - matures within one year, Fair value | 8,735 | 11,969
Available-for-sale - matures after one year through five years, Amortized cost | 99,386 | 78,920
Available-for-sale - matures after one year through five years, Gross unrealized gains | 0 | 227
Available-for-sale - matures after one year through five years, Gross unrealized losses | (5,149) | (818)
Available-for-sale - matures after one year through five years, Fair value | 94,237 | 78,329
Available-for-sale, Amortized cost | 108,142 | 90,857
Available-for-sale, Gross unrealized gains | 2 | 266
Available-for-sale, Gross unrealized losses | (5,172) | (825)
Marketable securities | $ 102,972 | $ 90,298

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